SP MODE is an update for the own sampler OS of the Akai S900 and S950 – one purchase, disk images for both samplers. Normally the sampler closes its anti-alias filter whenever a sample plays below its original pitch. SP MODE switches that filter tracking off on all 8 voices, so pitched-down samples keep their top end and alias the way an E-mu SP-12 does. Sampling, editing and disk functions work like on the stock OS.
New in v4: SP MODE also keeps the input filter open while you record. Use the classic 45 rpm trick: play the record at 45 instead of 33, sample it at around 8 kHz, then play it back 5 semitones lower – the treble folds back into the sample as SP-12 style grit.
- SP MODE on the Master Tune page: filter tracking off on all 8 voices
- Switch it from the front panel or via MIDI CC 77, live while playing
- FILTER 0-99 covers the whole range, about 166 Hz to 20 kHz on a log curve (S900: to 16 kHz)
- Input filter stays open while recording: low sample rates (around 8 kHz) keep the aliasing
- S950: sounds saved on the SP MODE disk load automatically after booting
- Finer filter steps with a 16-bit divider instead of 8-bit
- Filter clock never drops below 8 kHz, which keeps clock bleed out of the audio
Demo video
SP MODE on a stock S950: sine samples on 8 voices, then a Rhodes and the Amen break against an E-mu SP-12.
Tutorial: load the OS from disk, record a sample, change the pitch and switch SP MODE on and off with the knob. Works the same on the S900. Tip: 45 rpm trick + sample rate around 8 kHz.
Requirements: Akai S950, or Akai S900 with EPROM OS 1.2 or newer (it boots from disk; OS 1.0 cannot, and OS 4.0 itself is loaded from the disk). Floppy drive or Gotek, no soldering. Delivered as disk images (IMG + HFE) for S900 and S950 + README with step-by-step guide. Back to stock: boot from the internal ROM. Because of the new filter curve, existing programs can sound different than on the stock OS.
All OS Mods for vintage samplers
Use at your own risk. Back up your disks and samples before installing. TailOut Studios is not liable for damage to instruments, disks or data, or for loss of value of vintage hardware, unless caused intentionally or by gross negligence; liability for injury to life, body or health, under the German Product Liability Act and statutory consumer rights remain unaffected. Akai, S950, E-mu and SP-12 are trademarks of their respective owners, used solely to identify compatibility. This product is independent and not affiliated with or endorsed by them. Legal notes
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